McDonald’s is hiring auditors to take a thorough look at its nearly $1 billion advertising business, probing into troubling media practices like rebates revealed in the Association of National Advertising’s transparency report.

“We are reviewing and auditing everything,” Deborah Wahl, CMO for McDonald’s, told Digiday at the ANA Masters of Marketing in Orlando. “There’s lots of waste and fraud in the supply chain. We need to clean up all the channels and make sure the supply chain is transparent.”

Read the full Digiday article here.